Ji-Hyun Park

The major issue in aircraft industry is constructing risk management system for safety management because of increasing demand and advancement of the aircraft. This study is to assess the operational risks of aviation using IRPN(importance risk priority number) which is added to importance coefficient from RPN(risk priority number). In FMEA, RPN requires the factors like the occurrence (O), Severity (S), and Detection (D) of each failure mode. Therefore, the severity and detection is derived by

Anthrax lethal toxin (LeTx; a combination of protective antigen and lethal factor) is secreted by the vegetative cells of Bacillus anthracis and is cytotoxic for certain macrophage cell lines. First-time exposure of murine macrophage cells (RAW 264.7) to lethal toxin (LeTx) (0.1+0.1 mg/mL) caused extensive cell death with a survival rate of approximately 40%, but upon secondary exposure to LeTx and lipopolysaccharide (LPS) (1 μg/mL), after a few passages, these cells had a survival rate of appro

The rapid growth of engineering technology and the emergence of systemized and large-scale engineering systems have resulted in complexity and uncertainty throughout the lifecycle activities of engineering systems. This complex and large-scale engineering system consists of numerous components, but system failure can be caused by failure of any one of a number of components. There is a real difficulty in managing such a complex and large-scale system as a part. In order to efficiently manage the

This study is to develop a mathematical analysis model to grasp the behaviors of cartels. Cartels are formed tacitly and causetremendous damage to consumers in modern society which is composed of advanced industry structure. The government authoritieshave instituted the leniency programs to respond cartels. However, cartels will continue unless there are legal sanctions againstcartels based on an accurate analysis of leniency programs. The proposed cartel equilibrium analysis model is a mathemat

Earthmoving operations account for approximately 25% of construction cost, generally executed prior to the construction of buildings and structures with heavy equipment. For the successful completion of earthwork projects, it is crucial to constantly monitor earthwork equipment (e.g., trucks), estimate productivity, and optimize the construction process and equipment on a construction site. Traditional methods however require time-consuming and painstaking tasks for the manual observations of th